Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d323e2cc5391604…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 09:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c663dacea7bb101a31591271ef10c12a SHA-1: 865e5a6b80fcc369490ca051f0a853cc4d00f343 SHA-256: 8d323e2cc5391604530bd429d8a474d4243a834bd6d49dfe5071c76eb77c5535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to obscure the ultimate destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://umffz21.ru/admin/ckfinder/userfiles/files/71606968359.pdf In PDF document text
    • http://itemclinicchina.com/ckupload/files/66783564245.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/ridubesamidugusojapigixen.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/guwuxugefugobinu.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/xejagixotonesok.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/51299290430.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vikosewipuzowal.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/72730858832.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0dcd2cb5f---73507208045.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a477a90932---26602632962.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/47161869664.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42895467814.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94543830845.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/rudanagetafe.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/57910335299.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86104289083.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210922141433.pdfIn PDF document text
    • http://health-bridge.in/upload/file/bukafavaxidagekovefidides.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3346e1d1f3dd34d2b87730f3cc7a5669/damojebujoridurevoniwo.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dapibomi.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/54625417138.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/20107893299.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/kaduronutatogesoxebubise.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/43753882013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mobdro+tv+alternativePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 16728 bytes
SHA-256: 4e67a78a55d40ccd5d527ec88c562c3422bfd03940575575708f867b12ec42fb
font_01_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 10272 bytes
SHA-256: 9ae93bb9d45d816c65823a4693f919a578b59da373d9f753163d89fe0aa78eba
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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